Three major bushfires are still burning in southern WA after being sparked by lightning around Perth.

300 people have been evacuated form their homes while authorities have been unable to confirm reports that the Scaddan Primary School has been destroyed.

There is an emergency warning in place for residents in the Stockyard Creek, Mullet Lakes, Grass Patch, Salmon Gums and surrounding areas in the Shire of Esperance, meaning people are in danger and are being urged to take immediate action to survive.

A watch and act warning is in place for people in the Thomas River-Poison Creek area of Cape Arid National Park in Esperance, meaning there is a possible threat to lives and residents are urged to keep an eye on conditions.